2020MNRAS.494.5178F

Query : 2020MNRAS.494.5178F

2020MNRAS.494.5178F - Mon. Not. R. Astron. Soc., 494, 5178-5193 (2020/June-1)

The mass of our Galaxy from satellite proper motions in the Gaia era.

FRITZ T.K., DI CINTIO A., BATTAGLIA G., BROOK C. and TAIBI S.

Abstract (from CDS):

We use Gaia DR2 systemic proper motions of 45 satellite galaxies to constrain the mass of the Milky Way using the scale-free mass estimator of Watkins et al. (2010). We first determine the anisotropy parameter β, and the tracer satellites' radial density index γ to be β = -0.67+0.45–0.62 and γ = 2.11 ± 0.23. When we exclude possible former satellites of the Large Magellanic Cloud, the anisotropy changes to β = -0.21+0.37–0.51. We find that the index of the Milky Way's gravitational potential α, which is dependent on the mass itself, is the parameter with the largest impact on the mass determination. Via comparison with cosmological simulations of Milky Way-like galaxies, we carried out a detailed analysis of the estimation of the observational uncertainties and their impact on the mass estimator. We found that the mass estimator is biased when applied naively to the satellites of simulated Milky Way haloes. Correcting for this bias, we obtain for our Galaxy a mass of 0.58+0.15–0.14×1012 M☉ within 64 kpc, as computed from the inner half of our observational sample, and 1.43+0.35–0.32×1012 M☉ within 273 kpc, from the full sample; this latter value extrapolates to a virial mass of M_vir Δ=97=1.51+0.45^–0.40 ×1012 M☉ corresponding to a virial radius of Rvir = 308 ± 29 kpc. This value of the Milky Way mass lies in-between other mass estimates reported in the literature, from various different methods.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): Galaxy: fundamental parameters - Galaxy: halo - Galaxy: kinematics and dynamics - galaxies: dwarf - dark matter

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1498 4
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
5 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
6 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
7 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
8 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
9 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
10 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
11 NAME Horologium II G 03 16 32.1 -50 01 05           ~ 76 0
12 NAME For I GrG 03 29 35.7 -36 11 36           ~ 23 0
13 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
14 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
15 NAME Reticulum III G 03 45.4 -60 27           ~ 67 0
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
17 NAME Col I G 05 31.4 -28 02           ~ 60 0
18 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
19 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
20 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
21 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
22 NAME Antlia II Dwarf Galaxy G 09 35 32.8 -36 46 02           ~ 109 0
23 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
24 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
25 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
26 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
27 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
28 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
29 NAME NGC 3607 Group GrG 11 17 55.9 +18 07 35   9.9       ~ 57 0
30 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
31 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
32 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 117 1
33 NAME Crater II Dwarf Galaxy G 11 49 14 -18 24.8           ~ 176 0
34 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
35 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
36 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
37 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 352 1
38 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
39 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
40 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
41 Z 318-18 G 15 09 08.0 +67 13 21   13.60 10.6     ~ 1459 0
42 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
43 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
44 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
45 Z 300-12 G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1428 1
46 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
47 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
48 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
49 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
50 NAME GD-1 Stream St* 22 40 +31.           ~ 319 0
51 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
52 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
53 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
54 NAME Phe II G 23 39 59.4 -54 24 22           ~ 107 0
55 NAME Tuc III G 23 56.6 -59 36           ~ 229 0
56 NAME Local Group GrG ~ ~           ~ 9325 0

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